Potential new customer

So, what do you do if you have a potential customer walk up and ask for an estimate while your mowing, and you talk to your customer and she says that they are hard to deal with and a nutcase? I really don't know what to do here. Any suggestions?

talk, talk, talk, talk, then talk some more to the potential client. normally you can judge them through normal conversation about the desired work. put down the proposal on paper w/ EVERYTHING in writing w/ specific terminology.